garageCube

Does anyone know the max size of a DMX fixture grid? Is there a limit on the the number of unmapped pixels?

I have a rather complex fixture that is laid out on a giant grid. When I have a 100x76 (WxH) fixture, all my DMX outputs work for the 3159 pixels (9477 channels). When I use the same amount of channels, but make the grid 200x152, adding an "unmapped" box between each mapped channel, the DMX output is cut off at the bottom. I am doing this to try and account for the distance between each pixel in my matrix.

I generate the fixtures with a script and can see in madmapper the universes and channels count are identical between the 2 fixture types. You can see the high density and low density screenshots below.

Worth noting that the channel numbering starts from the bottom, meaning the first few thousand channels/universes are being omitted.

The grid size is limited by maximum texture size in the GPU. It looks like your graphics card says it can handle 32k texture size but doesn't. Can you try updating your graphics drivers ?
If it doesn't help I suggest you cut your fixture is two parts. You can still send me as PM your project file and I'll do some testing on a PC (on mac we're limited to 16k so grid cannot reach your resolution)